Sometimes women need a birth control backup plan. And when they do, there’s Plan B—the #1 OB/GYN‑recommended emergency contraception brand.
When to use Plan B
Plan B is emergency contraception women can take when:
Did you know?
Unlike other emergency contraception options, women can use Plan B when they are breastfeeding. In general, no harmful effects of progestin‑only pills like Plan B One‑Step have been found on breastfeeding performance or on the health, growth, or development of the infant. However, random cases of decreased (less) milk production in the mother have been reported.View all FAQs
How to take Plan B
Plan B emergency contraception helps prevent pregnancy by delaying ovulation. Here’s what women need to know about taking it:See how Plan B works
Plan B is safe and effective
Plan B contains levonorgestrel—the same active ingredient used in many popular birth control pills—just at a single, higher dose. That said, it shouldn’t be used as regular birth control, and it won’t protect against HIV/AIDS or other STDs.
Some women may experience side effects, including:
- A period that’s lighter, heavier, early, or late
- Lower abdominal cramps
- Breast tenderness
Potential drug interactions
Some drugs or herbal products that may decrease the effectiveness of progestin‑only pills (such as Plan B) include: barbiturates, bosentan, carbamazepine, felbamate, griseofulvin, oxcarbazepine, phenytoin, rifampin, St. John’s wort, topiramate, and certain HIV/AIDS medications (such as protease inhibitors and non‑nucleoside reverse transcriptase inhibitors).
Looking for more information?
Our consumer resources page has downloadable content to fit your needs—whether you’re looking for a brochure, ways to save, or a simple fact sheet.View consumer resources